Synthesis and study of substituted coumarins. A facile preparation of D,L-<i>o</i>-tyrosine
作者:George Kokotos、Chrysa Tzougraki
DOI:10.1002/jhet.5570230118
日期:1986.1
3-aminocoumarin (XII). Acidhydrolysis of XIII under the above mentioned conditions, (a) and (b), gave XII and 3-hydroxycoumarin (XVI), respectively. Hydrogenation of compound XIII in dioxane or in dimethylformamide with 10% palladium on charcoal gave 3-salicylaminocoumarin (XVII), while hydrogenation of XII, XIII or XVII in acetic acid with traces of water and palladium black gave the amino acid o-tyrosine.